I used Acura tls and found the housing to be plenty big enough on the first gen, can't speak for the second gen but i do recomend the jnc method JnC's Mounting Method (with Rotational Adj Capability)
it is way easier to get the cutoff to be level with each other, if i were to do it again i would do it that way instead of epoxy.

looks like i started something here, hehehe, the output from the fxrs will blast your old halogens out of the water, if you don't have a second car to use i would recomend going to your local scrap yard and trying to find a pair for cheap to work on